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The OnStream SC-x0 SCSI tape drives cannot be driven by the
standard st driver, but instead need this special osst driver and
use the /dev/osstX char device nodes (major 206). Via usb-storage,
you may be able to drive the USB-x0 and DI-x0 drives as well.
Note that there is also a second generation of OnStream
tape drives (ADR-x0) that supports the standard SCSI-2 commands for
tapes (QIC-157) and can be driven by the standard driver st.
For more information, you may have a look at the SCSI-HOWTO
http://www.tldp.org/docs.html#howto and
Documentation/scsi/osst.txt in the kernel source.
More info on the OnStream driver may be found on
http://sourceforge.net/projects/osst/
Please also have a look at the standard st docu, as most of it
applies to osst as well.